1-(3-phenoxy-2-benzoylamino)-propyl-pyrrolidines

ABSTRACT

AMIDES OF THE FORMULA:   R-O-CH2-CH(-CH2-A)-NH-CO-R1   WHEREIN R IS AN ALKYL, ALKENYL, ALKYNYL, ARYL OR ARYALKYL RADICAL, ALL OF WHICH MAY BE UNSUBSTITUTED OR SUBSTITUTED, A IS A TERTIARY AMINE GROUP INCLUDED IN A HETEROCYCLIC GROUP, AND R1 IS AN AROMATIC RADICAL WHICH MAY BE SUBSTITUTED IN THE NUCLEUS, OR AN ARYLALKYL RADICAL, AND THEIR ADDITION SALTS WITH PHYSIOLOGICALLY ACCEPTABLE ACIDS, HAVE VALUABLE CARIOVASCULAR PROPERTIES, AND ARE SUITABLE FOR THERAPEUTIC USE.

United States Patent Gflice 3,663,566 Patented May 16, 1972 Int. Cl. cim 27/04 US. Cl. 260-3263 5 Claims ABSTRACT OF THE DISCLOSURE Amides of the formula:

wherein R is an alkyl, alkenyl, alkynyl, aryl or arylalkyl radical, all of which may be unsubstituted or substituted, A is a tertiary amine group included in a hcterocyclic group, and R is an aromatic radical which may be substituted in the nucleus, or an arylalkyl radical, and their addition salts with physiologically acceptable acids, have valuable cardiovascular properties, and are suitable for therapeutic use.

This invention is concerned with certain novel amides, with a process for their preparation and with compositions containing them.

It has been found that amides of the formula:

wherein R is an alkyl, alkenyl, alkynyl, aryl or arylalkyl radical, all of which may be unsubstituted or substituted, A is a tertiary amine group included in a heterocyclic group, and R is an aromatic radical which may be substituted in the nucleus, or an arylalkyl radical, and their addition salts with physiologically acceptable acids, have valuable cardiovascular properties, and are suitable for therapeutic use.

The amides of Formula I and their acid addition salts are novel and constitute one aspect of the present invention.

The amides of Formula I are prepared by a four stage process.

Stage 1.Conversion of an alcohol of the formula, wherein R and A are as defined above into the corresponding chloride by reaction with thionyl chloride in chloroform.

Stage 2.-Treatment of the resulting chloro derivative with potassium phthalimide in dimethylformamide.

Stabe 3.Conversion of the resulting phthalimide into an amine of the formula,

by treatment with hydrazine in accordance with the process described by Ing and Manske (J. Chem. Soc.,

The use of this process to prepare the compound in which that is to say the compound 4-[3-isoamyloxy-2-(3,4,5- trimethoxy)benzoylamino] propyl tetrahydro 1,4- oxazine CH'CH2-OH20CHT OHCH2N b OCH i OCH;

will now be described by way of example only.

EXAMPLE First stage-4-(3-is0amyloxy-2-chloro.)-propyltetrahydro-1,4-oxazine soar in CHCl (CH3)ECH-CHr-CHz-O-CHz-CH-CHPIf o A solution of 180 g. of SOCl in anhydrous CHCl was added to a solution of 231 g. (1 M) of the aminoalcohol in 400 ml. of anhydrous CHCl with thorough stirring and while limiting the rise in temperature to not more than 55 C.

After completion of the addition, the whole was refluxed for 4 hours and, after evaporation of the solvent, the residue was poured onto crushed ice and rendered alkaline by the addition of 33% aqueous NaOH. The product was extracted with ether and, after drying of the extract over anhydrous Na SO and distillation of the solvent, it was distilled under vacuum to give 175 g. of a colorless liquid, B.P. (3 mm. Hg) C.; n =1.4625; yield: 70%.

Second and third stages-4-(3 isoamyloxy-2-amino)- propyl-tetrahydro-l,4-oxazine (CH )CH-CHg-CHg-0-OHCHCHz-I i 2) 3 4 175 g. (0.7 M) of the halogen derivative obtained in Total yield of the two stages from the halogen destage 1, 132 g. (0.8 M) of potassium phthalimide, and rivative=39%. 300 ml. of dimethylformamide were heated together for 8 hours at 110 C. After cooling, the KCl precipitate was Fourth stage.4 [3-isoamyloxy 2 (3,4,5-trimethoxyfiltered ofi and washed with 100 ml. of dimethylform- 5 benzoyl chloride amino] propyl-tetrahydro-l.4-oxaamide. The solvent was evacuated under vacuum and the zinc onto (CH )2CH-(CH2)2OCH2-CHCHz-N o CH O COCl l NH:

H30 N(C2H )3 f 5 (CH )iCH-CH -QH -O-OHz-CHF-OHq-N NH-CO- OCH;

OCH;

residue, which did not crystallize, was used in its crude 23 g. (0.1 M) of 3,4,5-trimethoxy-benzoyl chloride state in the next stage. were added, with thorough stirring and at a temperature 500 ml. of ethanol at 95 C. and 39 g. of hydrazine of 0 C., to a solution of 22.9 g. (0.1 M) of the previously hydrate were added to the residue and the whole was reprepared diamine in 100 ml. of chloroform. After the fiuxed for 2 hours. The mixture was acidified with conaddition, the mixture was allowed to return to ambient centrated HCl. The phthalhydrazine precipitate was filtemperature and then left to stand for overnight.

tered off and washed with alcohol. The filtrate was con- The solvent was removed, the residue was taken up in centrated to 100 ml., 500 ml. of water were added and, ether, filtered and washed with water. This ether soluafter filtration, this was concentrated to 200 ml. It was tion was dried over Na SO filtered and the product was rendered alkaline with NaOH and the oil formed crystallized by cooling. was extracted with ether. Distillation under vacuum gave 35 Recrystallization from anhydrous ether gave 30 g. of a 95 g. of product, B.P. (3 mm. Hg) 127-131 C. crystalline p 6 6 The product was then purified by crystallizing its di- N% calculated=6.6() fumarate from absolute alcohol and then recrystallizing N% found=6.57

from the same solvent. Yield=% After liberation of the base, the product was distilled e fu a of this base was also 'p p e' I again under vacuum and 63 g. of a, chromatog aphically shows the characteristics of this compound and of a numpure product were obtained, BF. (3 mm. Hg) 129 C.: ber of other compounds of Formula I and their salts that n =l.4650. have been prepared in an exactly analogous manner.

TABLE I Compound No. R A R; Constants 1 CE; 0/ \N 01130 Base, M.W. 410, mp. 87 C Fumarato, M.W. 526, mp. 117 C.

/CHCH1- CH O- CH3 3 I CHsO 2..;:.:;. CH Same as above.::- Same as abovo Base, M.W. 424, mp. (ES-64 (J... Fumarato, M.W. 540, 1u.p. 128 C;

CH-CHa-CH:-

3..-'.'..':: CH2 Z'LT..dO.----Z.'I.'Ii:2';2..dO.....:::I.IZZ.. Bass, M.W. 444, m.p. C Fuluarate, M.W. 560, mp. C.

4..::.::. Same as above.. :::::;;;;.-do-.. O N Q Base, M.W. 398, mp. 70 C Fumarato, M.W. 514, m.p.140 G;

5.....;:; '.....d0.....;.::. Same as above Base, M.W. 385, mp. C.. H01, M.W. 421.5, m.p. 150 C.

(l Same as above.;;:;:::;:;: .do.....:;;.;.:: CHsO Base, M.W. 432, IILI). 95 0-.."... HG], M.W. 168.5, 111.1). 110 C.

CHso

7 do Base, M.W. 341, mp. 70 C..:::'. Dl-HCl, M.W. 414, mp. C.

TABLE IContinued Compound o. A Ri Constants 8 do \N CIJHaO Base, MW. 414, nou-cristal llne. H01, M.W. 460.5, mp. 170 C.

-. CHa

Base, MW. 369, non-crista11lne.. H01, M.W. 405.5, 111.11. 140 0.

As indicated above, the compounds of Formula I and 5 their salts have valuable pharmacodynamic properties.

First, their acute toxicity, evaluated by determining the LD according to the conventional method of Behrens and Karber (Arch. f. exp. pharm., 177, 379 (1935) is substantially the same as those of drugs known at the present time for the same purposes. Thus, the LD in mg./kg., in the mouse when given orally, is as follows for some of the above-mentioned compounds and some known drugs:

The LD evaluated by the same method, but given intravenously, is 44 mg./kg. for compound No. 8 while for Lidocaine, Ajmaline and Propanol, it is 32, 26 and 30 mg./kg. respectively.

Second, these compounds act generally on the coronary rate, arterial tension, the forces of the cardiac contractions and the coronary oxygen pressure, 120 these effects having been demonstrated for a number of the compounds using the following method of investigation.

electrocardiogram, the integrated coronary rate, the arterial pressure and the p0 were recorded on a Beckman dynograph.

The products were administered venously (external saphenous vein) with a slow injection taking 1 minute.

These compounds as a whole have valuable anti-arrhythmic properties, causing the disappearance of the extra systoles induced by a strong dose of adrenaline injected intravenously and reducing the excitability of the isolated auricle.

Compound No. 8 is remarkable in this respect, showing an anti-arrhythmic activity that is greatly superior in all respects to that of drugs already known for this purpose.

The various aspects of these activities have been compared and the results are set out below, the index 100 being taken arbitrarily as a reference activity for each type of test for compound No. 8.

1) Arrhythmia caused by coronary ligature in the waking dog (Harris method).-Each value is the average of the results obtained from 10 animals.

A. Intravenous administration, 5 mgJkg.

Hydro- Compound Ajmaquini- Lido- Procain- Phe- Propra- Products N 0. 8 line dine eaiue amide nytoine nolol Activity (Ex. 8, index 100) 100 40 40 95 65 Duration of action (min.) 1017 8'40 X 8'07" X X 1715 B. Oral administration, mg./kg.

Hydro- Compound Ajrnaquini- Products N o. 8 line dine Activity (Ex. 8, index 100).-. 100 100 71 Start of action, min 36 53 44 Maximum duration of action, hr 8 6% 1 Because of destruction.

Norm-X activity lnsufliciently characteristic for its duration to be indicated.

The thorax of the test animal, a dog, was opened under chloralosis by resection of the fifth rib on the right side. A strain gauge was sewn onto the right ventricle. A catheter of the largest possible diameter was introduced into (2) Arrhythmia caused by strong doses of ouabain in the anaesthetized dog.

(Intravenous injection of ,ug. of ouabain in 1 minute causes very severe arrhythmia 15 to 25 minutes afterwards).

7 Intravenous administration, 1.25 mg./kg. (average of results from 10 animals) jugular by a duct penetrated by a fine catheter, which Products (lornplpxuns L133; rr e a i iconveyed blood to a Technicon autoanalyzer in which the e Activity (Ex. 8, index 100 100 10 total carbon dioxide and ammoma were determlned con 75 Duration action (mm) u 22 8 X tinuously. The contraction of the myocardium, the D Intravenous administration, 2.5 mgJkg. (Average of results from animals) Hydro- Compound qulni- Lido- Proeain- Phe- Propa- Products N o. 8 dine caine amide nytine nolol Activity (EX. 8, index 100) 100 36 100 82 54 182 Duration of action (min.) 22 X 8 X X 8 N GTE-X activity insufiieientiy characteristic to indicate its duration.

On this type of arrhythmia, only Propanolol is more active than compound No. 8, but the duration of action of compound No. 8 is here distinctly greater than that of all the reference products. 7

Compound 8 is also distinguished by a valuable anaesthetic activity, as the following comparisons show.

Local anaesthetic action (and of other aniarrhythmic drugs: Lidocaine, Procainamide).

Local conduction anaesthesia with intradermic administration 1n the guinea-pig (method of Bulbring and Wajda).

Percent of anaesthesia at 2% concentration First l mins., 24th hr. Products percent percent Compound N0. 8. 08 100 Lidocaine 96 0 30 The activity of compound No. 8 according to the concentration is comparable to that of Lidocaine, but its duration of action is much greater.

Activity as visceral analgesic. Method of KOSTER in the mouseoral administration.

Products: ED in mg./kg.

Compound No. 8 170 Lidocaine Without action The compounds of Formula I therefore appear to be suitable for the following therapeutic indications:

Myocardial anoxia Coronary insufficiency, angina Myocardial infarction Cardiac insufficiency linked with disturbances of coronary circulation Disturbances of rhythm Compound 8 is particularly advantageous for the latter indication.

These compounds may be administered orally, in the form of tablets, gelules, capsules, soluble granulates, drops or syrup, rectally, in the form of suppositories or rectal capsules, or by injection, in the form of bottles of lyophilized powder or ampoules. For this purpose the compounds are associated with inert, physiologically acceptable carries appropriate to the intended mode of administration. Suitable doses for the various modes of administration are summarized in the following table.

Mode of Unit Preferred administration dose, mg. dose, mg.

Oral 50-100 Injectabie..- 50-500 250 Rectal l00200 What we claim is: 1. An amide of the formula:

References Cited Wagner et al. Synthetic Organic Chemistry (1953), pp. 92, 679, 566.

ALEX MAZEL, Primary Examiner I A. NARCAVAGE, Assistant Examiner US. Cl. X.R.

260-2472 A, 250 A, 326 A; 424248, 274 

